176 Myxomycetes. — Pflanzenkrankheiten. 



der Herausgeber aus der Priegnitz. Zwei Nummern aus Nieder- 

 österreich hat F. V. Höhnel beigetragen. 



Eigentlich ist jede Nummer bemerkenswert und interessant. 

 Aus der Provinz Brandenburg (Priegnitz) hebe ich besonders 

 hervor Comatricha piilchella (Church, Eab.) Rost. var. tenerrima 

 (Curt.) Lister und Diachea siibsessilis Peck, die der Herausgeber in 

 der Priegnitz entdeckt hat. Besonderes [nteresse haben wieder 

 die von Ch. Meylan in der Schweiz und von W. C. Sturgis in 

 Colorado gesammelten Arten wegen der bedeutenden Höhe ihrer 

 Standorte. So sammelte Meylan in der Schweiz Lepidoderma ti- 

 gviniim (Schrad.) Rostr. bei St. Croix im Jura in ca 1200 m Höhe 

 und Diderma radiatitm (L.) Lister bei M*:. Suchet im Jura in 1250 

 m Höhe, während W. C. Sturgis in Colorado im Wet Mt. 

 Valley in 8000—8500 Fuss Höhe Ceratiomysa fniticidosa (Müll.) 

 Macbr., Cribraria argillacea Pers., C. mirantiaca Schrad., Diciydiuni 

 cmicellaiiini (Batsch.) Macbr. und Diderma Trevelyani (Grev.) Fr. 

 gesammelt hat. 



Wie schon oben hervorgehoben, sind besonders wichtig die 

 von Frl G. Lister in England gesammelten Arten. Ich nenne 

 daraus das PJiysarum hitectiini List., Didyniiuui anelhis Morgan, 

 Badhamia foliicola List., B. rubiginosa (Chev.) Rost. y. globosa'L'is.i., 

 Physaruni didernioides (Ach.) Rost. var. lividum Lister, Fuligo cine- 

 rea (Schwein.) Morgan und Didymium diibiiini Rost. 



Die Exemplare sind durchweg sorgfaltig ausgesucht, und, wie 

 stets in diesem Exs'ccatenwerke, in Schachteln ausgegeben. 



, P. Magnus (Berlin). 



Pethybridge, G. H., Further b s e r v a t i o n s o f t h e PÄj'- 

 tophthora eiythroseptica Pethybr., and on the Disease 

 produced by it in the Potato Plant. (Sei. Proc. Roy. 

 Dublin Soc. XIV. 10. p. 179-198. 1 Plate. 1914.) 



The further observations on this new disease deal with the de- 

 tails of germination of the conidia and oospores and with the mi- 

 crochemical reactions of their cell walls; also with the distribution 

 of the fungus in the various parts of the potato plant. 



Oospores were induced to germinate when taken from cultures 

 9 months old. The walls of the oogonium and oospore each con- 

 sists of two layers, the inner in each case of cellulose, but that of 

 the oospore differing slightly in its chemical reactions from that of 

 the oogonium. Previous to germination the inner wall of the 

 oospore dissolves and apparently serves as a reserve food-suppl}' 

 for the germ tube. Sexual organs were found in nature, especially 

 at the base of diseased stems which had become hollow through the 

 destruction of the pith. 



The conidia and hyphae are composed largely but not entirely 

 of cellulose: the former germinate by producing germ tubes or by 

 the formation of zoospores, the degree of ripeness being suggested 

 as a possible determining factor. Infection by the fungus causes 

 not only destruction of the tuber, but apparently also a wilting of 

 the subaerial organs hence the name „Pink Rot Wilt" is suggested. 



A. D. CoUon. 



Shaw, F. J. F., A sclerotial Disease of Rice. (Mem. Dept. 

 Agric. India. Botan. Ser. VI. 2. p. 11—23. 3 pl. July 1913.) 



The author re investigates the sclerotial disease of Rice descri- 



